[en] Ion mobility-mass spectrometry (IM-MS) has emerged as a powerful separation and identification tool to characterize synthetic polymer mixtures and topologies (linear, cyclic, star-shaped,...). Electrospray coupled to IM-MS already revealed the coexistence of several charge state-dependent conformations for a single charge state of biomolecules with strong intramolecular interactions, even when limited resolving power IM-MS instruments were used. For synthetic polymers, the sample's polydispersity allows the observation of several chain lengths. A unique collision cross-section (CCS) trend is usually observed when increasing the degree of polymerization (DP) at constant charge state, allowing the deciphering of different polymer topologies. In this paper, we report multiple coexisting CCS trends when increasing the DP at constant charge state for linear poly(acrylamide) PAAm in the gas phase. This is similar to observations on peptides and proteins. Biomolecules show in addition population changes when collisionally heating the ions. In the case of synthetic PAAm, fragmentation occurred before reaching the energy for conformation conversion. These observations, which were made on two different IM-MS instruments (SYNAPT G2 HDMS and high resolution multi-pass cyclic T-Wave prototype from Waters), limit the use of ion mobility for synthetic polymer topology interpretations to polymers where unique CCS values are observed for each DP at constant charge state.
Research center :
MolSys - Molecular Systems - ULiège Mass Spectrometry Laboratory (MSLab) CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry
Author, co-author :
Haler, Jean ; Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de spectrométrie de masse (L.S.M.)
Far, Johann ; Université de Liège > Département de chimie (sciences) > Center for Analytical Research and Technology (CART)
Aqil, Abdelhafid ; Université de Liège > Département de chimie (sciences), Complex and Entangled Systems from Atoms to Materials (CESAM) > Centre d'études et de rech. sur les macromolécules (CERM)
Claereboudt, Jan; Waters Corporation
Tomczyk, Nick; Waters Corporation
Giles, Kevin; Waters Corporation
Jérôme, Christine ; Université de Liège > Département de chimie (sciences), Complex and Entangled Systems from Atoms to Materials (CESAM) > Chimie des macromolécules et des matériaux organiques (CERM)
De Pauw, Edwin ; Université de Liège > Département de chimie (sciences) > Laboratoire de spectrométrie de masse (L.S.M.)
Language :
English
Title :
Multiple Gas-Phase Conformations of a Synthetic Linear Poly(acrylamide) Polymer Observed Using Ion Mobility-Mass Spectrometry
Publication date :
2017
Journal title :
Journal of the American Society for Mass Spectrometry
ISSN :
1044-0305
eISSN :
1879-1123
Publisher :
Elsevier Science, New York, United States - New York
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